Maintaining Gateway Connectivity in Multi-hop Ad hoc Networks

Authors:
Robert Brannstrom;Christer Ahlund;Arkady Zaslavsky
Affiliations:
Lulea University of Technology, Sweden;Lulea University of Technology, Sweden;Monash University
Venue:
LCN '05 Proceedings of the The IEEE Conference on Local Computer Networks 30th Anniversary
Year:
2005

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Abstract

The need for maintaining gateway connectivity in an ad hoc access network is vital considering the 80/20 ratio of Internet traffic. There are several proposals of how to integrate gateway forwarding strategies but they all rely on the route discovery procedure of reactive routing protocols. We propose a proactive approach to avoid the delay of the route discovery process. Mobile IP is often suggested to handle macro mobility and we use the advertisements periodically sent by the gateway to update routing tables in the ad hoc network. Since advertisements may arrive to a mobile host through multiple paths, it is important to keep track of the best path to each gateway. We demonstrate the use of a proposed dynamic metric and how to handle location of correspondent hosts. A simulation study demonstrates the usefulness and efficiency of our approach.